[lxc-users] Getting kdump to work on an LXC server

[Serge Hallyn]

Quoting Rod Bruce (rod.bruce at mnsu.edu):
> Greetings,
> I have been working on a problem the last couple of days and I believe I
> have come up with a solution so I thought I would share it with the list
> in case anybody else runs into this or someone has a better solution.
> 
> 
> Problem:
> I have had a server running Ubuntu 14.04 hang a couple of times. I try
> to run everything using standard Ubuntu packages. The server is an LXC
> host with two containers running on it (but several more planned). I
> wanted to get a kernel core dump if it hung again so I started
> investigating kdump/kexec. I installed, configured, and tested
> kdump/kexec on another server and it worked as advertised. However, when
> I tried it on the LXC server it would save the core dump OK but the
> server would fail to reboot or hang at some other point in the process.
> 
> I noticed that when kexec was booting the secondary kernel it was
> starting up all of the services that start on a normal boot, including
> LXC, and that seemed to be causing a problem. When I set the containers

Do you have any idea why it was causing a problem?

Now that you are kexecing into runlevel 2, after you do that, are you
able to start the lxc service and lxc container by hand?